There are two main types of the LED HDTV, and they can be split into two
different versions by the type of back lighting they use. One is called
an edge-lit LED and the other is known as a back-lit LED television. In
this article we will look at the back-lit LED HDTV and try to
understand how it works.
What is a Back-lit LED HDTV?
All
TVs of this type are lit by LED lights, which have been shown to give
some advantages over other types of lighting. Back-lit LED televisions
have the LED lights placed directly behind the screen, which is similar
the the way an LCD TV has it's lighting arranged.
These LED
lights are placed into blocks, and are grouped together so that they can
be controlled at the same time. Therefore, each block has the ability
to be switched off and on separately to the other blocks around it. The
advantage of this is that in an image with some dark areas and some
light areas, the dark parts can have their blocks switched of completely
to enable an completely black signal.
This extra control isn't possible on an LCD television.
Local-dimming Technology
The
name of this technique is local dimming, and this is the term you
should be looking for if you want to buy an LED TV that is built in this
way. The main advantage is an LED HDTV with this type of technology may
have a better contrast ratio than other types of high-definition
television. LCDs have always traditionally had a problem with a poor
contrast ratio compared to that of a plasma TV, and so this method of
backlighting is aimed at addressing this problem.
The Problems With Local-dimming
As
ever with all of this technology, there is a downside to this idea. The
problems occur when one block of lights is covered by a light and a
dark part of the image. This will then have the same problems associated
with an LCD TV where the block cannot be switched of completely, and so
it is impossible to get the black part completely dark.
There is
a way to resolve this issue, and that would be to have one LED light
for every pixel on the TV screen - but the problem with this is that it
would be far to expensive to build a TV in this way and so they would be
too expensive for most people to buy. However, with all things taken
into account, this method of building a back-lit LED HDTV does generally
produce a TV with a better picture than that of most LCD TVs.
LED HDTV Summary
So
as we can see, there is actually more than one type of LED HDTV that
you can buy, and the way that it is built can have a big effect on the
quality of the picture that you get. So if you are looking to buy an LED
television then it is important to understand the differences in design
because they can have a big impact on the performance of the TV.
Back-lit
LED HDTVs also have a couple of other disadvantages when compared to
edge-lit models - or LCD televisions for that matter. You can find out
more about these issues by visiting the links in the resource box below.
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